package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * wx use login
     * @param code
     * @return
     */
    public User wxLogin(String code) {
        String openid = getOpenid(code);
        //检查传入openid
        if(openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //检查用户是否存在 不存在就添加进数据库
        User user = userMapper.getByOpenId(openid);
        if(user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.addUser(user);
        }
        return user;
    }

    private String getOpenid(String code) {

        //通过httpclient来调取微信登录接口
        Map<String, String> map = new HashMap<>();
        map.put("grant_type", "authorization_code");
        map.put("js_code", code);
        map.put("secret", weChatProperties.getSecret());
        map.put("appid",weChatProperties.getAppid());
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, map);

        //返回的是json数组的字符串，要转化成json

        JSONObject jsonObject = JSON.parseObject(json);

        String openid = jsonObject.getString("openid");

        return openid;
    }
}
